All solid state mid-infrared optical parametric oscillator

Abstract

An all solid state mid-infrared optical parametric oscillator comprises a 1.5 mum narrow linewidth laser diode (hereinafter referred to as LD) with pigtail output, a focusing coupling system, a first plane mirror, Er:YAG laser crystal, a saturable absorber Cr:ZnSe, a polarizer, a quartz plate etalon, a second plane mirror, MgO:PPLN nonlinear periodically poled crystal and a third plane mirror which are successively arranged along the laser output direction of the laser diode; a calcium fluoride etalon and a flat-concave cavity mirror are successively arranged along the reflected light direction of the second plane mirror. The pumping source of the invention is passively Q adjusted 1.6 mum pulse laser, the structure of the whole system is simpler and more compact, the power density of 1.6 mum laser in the cavity can be used, the converting efficiency and the output power of the whole QPM-OPO system is improved, the working wavelength of the whole system is controlled at the wave band safe to human eyes, the tunable output of the all solid state mid-infrared optical parametric oscillator is realized.

Description

technical field [0001] The present invention relates to mid-infrared lasers, in particular to an all-solid-state mid-infrared optical parametric oscillator, which is based on periodically polarized crystals and quasi-phase-matching technology, and utilizes an inner-cavity OPO, in which the pump source adopts passively Q-switched 1.6 μm Pulse laser, an all-solid-state mid-infrared optical parametric oscillator for high-power mid-infrared laser output. Background technique [0002] Since the mid-infrared laser in the 3-5μm band is just in the atmospheric window, and is also in the absorption band of some harmful and toxic gases, as well as important molecules such as water and carbon dioxide, the mid-infrared laser is widely used in lidar, remote sensing, environmental monitoring, medical and Infrared countermeasures and other aspects have important application value and prospects. [0003] Based on the acquisition of 3-5 μm lasers in the mid-infrared band, relevant instituti...

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Problems solved by technology

In the above two experiments, the same-band pumping technology was used, that is, the Er-doped fiber laser was used as the pump source of the Er:YAG laser, but the system using 1.6 μm laser as the QPM-OPO pump source did not achieve full curing. , the complex structure increases the volume of the whole system, and the Er-doped fiber laser in the whole system must use LD near 980nm as the pump source, resulting in the quantum conversion efficiency of the whole QPM-OPO system being limited by the first-stage pump source extremely restrictive

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